package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str="好好学习Java";
        StringBuilder builder=new StringBuilder(str);
        builder.append(",为了找个好工作");
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        //delete():删除部分内容（含头不含尾）
        builder.delete(0,8);//删除下标为0到7的
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);

        //StringBuilder的创建方式:
        /*
        StringBuilder builder1=new StringBuilder();//空字符串
        StringBuilder builder2=new StringBuilder();//abc串

        //String和StringBuilder互转:
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);//abc串
        String str2= builder3.toString();

         */


    }
}
